GENERAL KNOWLEDGE

Detailed explanation-1: -A molecular formula is a representation of a molecule that uses chemical symbols to indicate the types of atoms followed by subscripts to show the number of atoms of each type in the molecule. (A subscript is used only when more than one atom of a given type is present.)

Detailed explanation-2: -A molecular formula is a chemical formula of a molecular compound that shows the kinds and numbers of atoms present in a molecule of the compound.

Detailed explanation-3: -The periodic table displays all of the known elements and is arranged in order of increasing atomic number. In this table, an element’s atomic number is indicated above the elemental symbol. Hydrogen, at the upper left of the table, has an atomic number of 1.

Detailed explanation-4: -To calculate the number of atoms first step is to calculate the number of moles. If the mass of an element/compound is given then divide the given mass by the molar mass of the element/compound to find the number of moles. In 1 mole of a substance, the number of atoms is or. 023 × 10 23 atoms.

Detailed explanation-5: -A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of atoms of the elements present in the compound as well as how many there are for each element, in the form of subscripts.